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因为grass,意思是草、草地,是不可数名词,例如:
1、Flatten the surface of the grass with a roller.用碾轧机把草轧平。
2、The plant resembles grass in appearance.这种植物的外形像草。
3、You're not supposed to walk on the grass.不准践踏草地。
4、The grass had withered in the warm sun.这些草在温暖的阳光下枯死了。
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